The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 01, 2014
Filed:
Aug. 23, 2012
Atsushi Miyazaki, Kiyosu, JP;
Koji Okuno, Kiyosu, JP;
Shugo Nitta, Kiyosu, JP;
Toyoda Gosei Co., Ltd., Kiyosu-shi, Aichi-ken, JP;
Abstract
On a light-emitting layer, a p cladding layer of AlGaInN doped with Mg is formed at a temperature of 800° C. to 950° C. Subsequently, on the p cladding layer, a capping layer of undoped GaN having a thickness of 5 Å to 100 Å is formed at the same temperature as employed for a p cladding layer. Next, the temperature is increased to the growth temperature contact layer in the subsequent process. Since the capping layer is formed, and the surface of the p cladding layer is not exposed during heating, excessive doping of Mg or mixture of impurities into the p cladding layer is suppressed. The deterioration of characteristics of the p cladding layer is prevented. Then, on the capping layer, a p contact layer is formed at a temperature of 950° C. to 1100° C.